Heat and edging variation questions

Hi

1. When warming up, is there any negatives to heating for extended period of time like say half hour? I heard a few people say this could lead to exhaustion but wondering if thats true?

2. Edging. Sometimes if I’m not feeling aroused to properly edge, ill do a 2 handed edging technique where all I’m doing is stroking my penis to maintain a 70-90% erection, if I think dirty I can get it to 100 but then I gotta pay attention not to blow lol . I can do this 2 handed technique longer than edging, sometimes up to a whole hour (while watching tv lol or else id get bored), andim wondering if theres any benefit to this as I’m keeping my penis extended and flowing with blood (I’m not reaching for ponr and then backing off likei would while edging) for a long period of time similar to edging?

Thanks!